Baby vs super 17 = Baby
Baby and super 17 vs syn shenron = Syn Shenron
Ss4 goku vs ss4 vegeta = SS4 Goku, he is always one step advanced to Vegeta.
Majuub vs kid buu = Majuub cus the old form of kid buu and UUb the incarnation of Kid buu only can defeat his old form.